Patent GB-941316-A (GB)
Title: Improvements in or relating to sewing machines suitable for use in sewing together an upper and sole member of a shoe
IPC: D05B15/00
Filed: 1960-01-22
Abstract: 941,316. Butting welts. BRITISH UNITED SHOE MACHINERY CO. Ltd. Jan. 22, 1960 [Jan. 23, 1959], No. 2342/60. Addition to 811,605. Heading A3B. [Also in Division D1] The machine of the parent Specification, in which a shoe upper, insole and welt are sewn together all around the shoe, and in which a feeler is arranged to be engaged by the leading end of the welt first sewn to the shoe whereby an electro-magnetic device is energized to cause actuation of a welt-severing knife, is modified in that a guard member provided for the feeler is adapted to press the leading end of the welt positively into engagement with the shoe upper in advance of the feeler to ensure uniform engagement of the latter with said end, the feeler also being mounted on a carriage having track means for confining its motion to a path such that the angle of inclination of the guard is less than that of the angular face of the welt produced by the severing knife. The feeler 12 is pivoted at 60 to the guard 16 and its forward end is biased downwards lightly against the latter by a spring 62. Guard 16 is connected by bolts 64, 66 to a plate 72, the bolts carrying rollers to constitute a carriage, and the rollers being engaged within a downwardlycurved track or guideway 78 formed in a plate 80. The carriage is normally held in its retracted position by a spring 158 connected by a bar 154 to bolt 66, but is advanced, near the end of the sewing operation, to place the front end of the feeler in a position such that it will be engaged by the leading end 10 of the welt 6. A surface 18 on the guard, having an inclination less than that of the leading face 42 of the welt, is adapted to engage the leading end of the welt. Said end is thereby held positively against the shoe upper 4 while the front end of the feeler, which lies within a notch 46 formed in the guard, is being engaged by the upper corner 44 of face 42 to rock the feeler and thereby close an electrical circuit to effect actuation of the knife. The front end of the guard is also formed on its inner face with a ridge 58 adapted to prevent accidental engagement of the latter with an upstanding portion of the shoe upper. Plate 80 is secured to a slide 92 normally clamped between a pair of guide plates 90, 94 secured to a fixed plate 84. On slackening of plates 90, 94, slide 92 may be adjusted horizontally by turning a bolt 174. Plate 72 is connected by a pivoted link 153 to a crank disc 148 carried by the armature of a rotary solenoid. The latter is energized near the end of a sewing operation to rotate disc 148 clockwise through 90 degrees. The rollers carried by bolt 66 thereby move to the front end 134 of the track 78, and a contact plate 104 mounted on the rear end of feeler 12 is positioned above a pair of contacts 108, 110 carried by an insulating block 112 mounted adjustably on plate 80. When feeler 12 is rocked on engagement with the leading end of the welt, plate 104 bridges the contacts 108, 110 to effect actuation of the welt severing knife. When the rotary solenoid is deenergized, spring 158 returns the carriage to its retracted position, when a pin 136, carried by block 112, engages a new surface on the lower edge of the feeler to raise the rear end of the latter positively. Specification 900,976 also is referred to.